Improvement in coloring-matters



UNITED STATES PATENT OFFICE.

JOHN P. GRIESS, OF BURTON-ON-TRENT, GREAT BRITAIN, ASSIGNOR TO BADISOHEANILIN AND SODA FABRIK, OF BADEN, GERMANY.

IMPROVEMENT IN COLORING-MATTERS.

Specification forming part of Letters Patent No. 213,563, dated March25, 1879; application filed February 12, 1879.

To all whom it may concern:

Be it known that I, JOHN PETER GRIESS, of Burton-on-Trent, in the countyof Stafford, England, have invented a new and useful Improvement inDye-Stuffs or Coloring-Matters, which improvement is fully set forth inthe following specification.

This invention relates to a crimson coloringmatter or dye-stuff, whichmay be termed anisol-crimson, and which is capable of replacingcochineal, lac-dye, or similar dyes in some of their industrialapplications.

The said coloring-matter belongs to the class of the so-calledazo-compounds, and results from the action of diazo-anisol upon analkaline solution of the disulpho-acid of naphthol.

In carrying out my invention I take the substance known to chemists asanisidinethat is to say, the amido-compound of anisoland I first preparea hydrochlorate of anisidine with nitrous acid until the latter ceasesto be absorbed. I then mix the solution of, say, about one molecule ofthe hydrochlorate of diazo-anisol thus obtained with an alkalinesolution of about one molecule of the disulphoacid of naphthol,(beta-naphthol being employed by preference,) and Itake care to keep themixture slightly alkaline until the close of the operation.

From the action of the diazo-anisol upon the abovenamed solutionot'disulpho-acid of naphthol results the anisol-crimson, which may beprepared for commerce by precipitating it from the mixture by means ofcommon salt or otherwise, and the precipitate thus formed may befiltered and dried.

By substituting in the above process monosulpho-acid of naphthol for thedisulpho-acid a different coloring-matter is produced, which may betermed anisol-red, and which forms the subject-matter of a differentapplication for a patent.

The anisol-crimson prepared by the above process is the alkaline salt ofa strong organic sulpho-acid. Its chief characteristics are thefollowing: It has the appearance of a reddishbrown crystalline powder,which is soluble in water and alcohol, but insoluble in hydrocarbons.The color of the solution in water is crimson, and in alcohol is orange,and is changed by an excess of alkali into a more yellowish tint.Mineral acids in excess give to the solution a more purplish tint.The'anisol-crimson dissolves in concentrated sulphuric acid with apurple color. Reducing agents, such as pro- A tochloride of tin, or tincrystals, decolorize the solution and regenerate anisidine, which may beseparated from the mixture by adding an excess of caustic alkali,whereby the said organic bases are set free, and may be obtained in apure state by distillation or extraction.

For dyeing animal fiber the anisol-crimson is employed in an aciddye-bath, with or without the presence of metallic mordants, and theanisol-crimson may also be used for dyeing cotton by employing itsproperty of forming insoluble compounds with some metallic saltssuch,for instance, as aluminate of zinc.

What I claim as new, and desire to secure by Letters Patent, is

As a new manufacture, the crimson coloring-matter produced by the actionof the diaZo-anisol upon an alkaline solution of disulpho-acid ofbeta-naphthol, substantially as described, or by any other means whichwill produce a like result.

In testimony that I claim the foregoing I have hereunto set my hand andseal this 1st day of January, 1879.

JOHN PETER GRIESS. n s.]

Witnesses J. BRAME, 0. ALLENDER,

